San disk ultra II won't show up on computer

Hi i have a sandisk Ultra II 4GB. I plugged it into the computer directly and through the camera with a usb but the computer won't find it. when i plugged the sd card into my old camera the camera said there was something wrong with it....some kind of error. it works on only my new camera. how can i fix this?

You'll have to go to Sandisk.com to verify this for your specific model, but... the problem is
that some firmware versions won't recognize over a 2GB card. There may
be a firmware update available. Find your product on the site using
search, and then look for software updates. Don't hesitate to call
techsupport (866-726-3475).... usually NOT a long wait, they speak
clearly and they're polite.

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Remove the SD card from the camera. Slide the tiny switch on the side of the card to its other "unlocked" position. Reinsert the card in the camera. But if you've already tried this, see this link for additional things that you can try.

K in this case just insert the memory card inside the card reader...........Connect the card reader to the computer...........Go to My Computer..........Right Click On Removable Drive/Disk which is the Memory Card................Click On Format.............And now click on start as soon as it is finished just remove it from there and use it........Good Luck